﻿<blockquote class="extDef">NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
This function checks the weights associated with the control points of a
rational b-spline surface and returns TRUE if they are all
positive.</blockquote>

<blockquote class="note">NOTE&nbsp; Function adapted from <strong>surface_weights_positive</strong> defined in ISO 10303-42.</blockquote>
<blockquote class="history">HISTORY&nbsp; New function in IFC4</blockquote>